Printing waste gas treatment

Printing waste gas is mainly the ink waste gas generated during printing and the gasoline volatile waste gas used to clean up the ink stick.

(1) A small amount of ink exhaust gas volatilized during printing, this part of the exhaust gas volatilization is small, the main components are low-grade hydrocarbons, does not contain benzene, toluene and other harmful components, the amount generated by 10% of the amount of ink, emissions of 0.3t / a;

(2) Clean up the ink stick and printing layout gasoline volatilization of exhaust gas. The amount of gasoline volatilization is calculated as non-methane total hydrocarbons.

1, a small amount of ink exhaust gas volatilized during printing, this part of the exhaust gas volatilization is small, the main components of low-grade hydrocarbons, does not contain benzene, toluene and other harmful components, the amount generated by 10% of the amount of ink, the general ink generated by the exhaust gas is mainly the volatilization of ink thinner generated by non-methane total hydrocarbons organic substances.

2, the dust in the ink, to carbon black as a pollution factor for the control of the standard. PM10 consideration, governance measures to pay attention to. If the ink is oil-based, it can be considered that in the use of the process of organic solvents all volatile, only in time periods.

3, compared with solvent-based ink, offset printing ink in organic solvents are few, so the volatilization of organic solvents is less, causing less pollution to the environment. Offset printing mostly printed paper ink using oxidation conjunctive drying or offset uv ink using ultraviolet curing drying emissions are very small.

>>Emission standards

Exhaust emission standards, with reference to the "Volatile Organic Compounds Control Emission Standards" (GB37822-2019), "Shandong Province Volatile Organic Compounds Emission Standards" (DB37-2801), the emission standards for exhaust gases are as follows:

(1) information provided by the owner in relation to the project

(2) "Law of the People's Republic of China on Environmental Protection" (2015-01-01)

(3) "Air Pollution Prevention and Control Law of the People's Republic of China" (2016-01-01)

(4) Ambient Air Quality Standards (GB3095-2012)

(5) "Law of the People's Republic of China on the Promotion of Cleaner Production", Decree No. 72 of the President of the People's Republic of China

(6) National Environmental Protection "Thirteenth Five-Year" Plan

(7) "Comprehensive Emission Standards for Air Pollutants" (GB16297-1996)

(8) "Emission Standards for Odor Pollutants" (GB14554-1993)

(9) "Environmental Protection Design Code for Construction Projects" (GB50483-2009)

(10) "Design Code for Heating, Ventilation and Air Conditioning" (GB50019-2003)

(11) "Building Design Fire Code" (GB50016-2014)

(12) "Code for the design of power supply and distribution systems" (GB50052-2009)

(13) "Emission Standards for Volatile Organic Compounds Control in Industrial Enterprises" DB13/2322-2016

The proposed process route uses "catalytic combustion + activated carbon adsorption desorption + fan" for effective exhaust gas treatment. The process equipment diagram is as follows:

Catalytic combustion + activated carbon adsorption and desorption + fan

(1) After the waste gas is pretreated to remove dust and particulate matter, it is sent to the activated carbon adsorber. When the activated carbon adsorber Ⅰ is close to saturation, firstly, the treated gas is automatically switched to the activated carbon adsorber Ⅱ (activated carbon adsorber Ⅰ stops adsorption operation), and then the hot airflow is used to desorb and desorb the activated carbon adsorber Ⅰ to desorb the organic matter from the activated carbon. In the desorption process, the organic waste gas has been concentrated, the concentration is tens of times higher than the original, up to 2000ppm or more, the concentrated waste gas is sent to the catalytic decomposition device, and finally it is discharged as CO2 and H2O.

(2) After completing desorption and desorption, the activated carbon adsorber Ⅰ enters the standby state, and when the activated carbon adsorber Ⅱ is close to saturation, the system automatically switches back and desorbs and desorbs the activated carbon adsorber Ⅱ at the same time, so the cycle works.

(3) When the concentration of organic waste gas reaches 2000ppm or more, the catalytic bed can be maintained in self-ignition without external heating. This solution not only saves the energy consumption greatly, but also reduces the equipment investment because the processing capacity of catalytic decomposer is only 1/10 of the original exhaust gas processing capacity. This solution is suitable for both continuous and intermittent operation.

1 Field visit Technical survey

2 Secondary demonstration Provide solutions

3 Technical exchange Both sides visit each other

4 Construction according to the contract Acceptance and delivery

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